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The twin engine Learjet 24 was developed from the 23 model, but MTOW was increased to the maximum 13,500 lbs permitted by FAR 25 standards. It also had increased cabin pressurisation, giving a higher operating altitude, an additional window and uprated General Electric CJ610-4 engines.
The first Learjet 24 flight took place on 24 February, 1966. Certification came in March and deliveries commenced towards the middle of the year.
The 24A variant was certified by the FAA on 9 November, 1966. Then the 24B, powered by two General Electric CJ610-6 turbojet engines for greater speed and range, was approved on 17 December, 1968. The longer range 24D had a take off weight of 13,512 lbs and round cabin windows. It received FAA certification on 17 July, 1970 and replaced the 24B in production. There was also a light weight version, the 24D/A, restricted to 12,500 lbs for take off.
In 1976, two new versions were announced; the shorter range 24E and the 24F had a cambered wing and aerodynamic improvements that reduced stall and approach speed. There were powered by two 2,950 lbf thrust General Electric CJ610-8A turbojets. Production of the Learjet 24E was terminated during 1979, and that of the Learjet 24F during 1980.
The Learjet 25 is a stretched version of the 24 that can seat up to eight passengers. It was first flown on 12 August, 1996, certified by the FAA on 10 October, 1967 and deliveries commenced in November 1967.
Learjet 25B and Learjet 25C variants were produced from late 1970, the latter having additional fuel capacity, and a few years later models 25D and 25G came to market, bearing more advanced CJ610-8A engines and with a ceiling increase to 51,000 ft. Production ceased in 1982.
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| World fleet | Charter fleet | Typical pax | Cabin volume | Cruise | Range | Years | |
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| Learjet 24A | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
| Learjet 24 | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
| Learjet 25 | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
| Learjet 24B | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
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| Learjet 25C | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
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| Learjet 25D | ●● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● | |
| Learjet 25G | ● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● |
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